892 research outputs found

    Design of a Mobile Underwater Charging System

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    Autonomous Underwater Vehicles (AUVs) are extremely capable vehicles for numerous ocean related missions. AUVs are energy limited, resulting in short mission endurance on the scale of hours to days. Underwater Gliders (UGs) are able to operate on the order of months to years by using nontraditional propulsion methods. UGs, however, are unable to perform missions requiring high speed or direct forward motion due to the nature of their buoyancy driven motion. This work reviews the current state of the art in recharging AUVs and offers an underwater recharging network concept at a significantly reduced cost to traditional methods. The solution includes the design of a UG capable of serving as charge carrying agent that couples with and charges AUVs autonomously. The vehicle design is built on the work done previously at the Nonlinear and Autonomous Systems Lab on the development of ROUGHIE (Research Oriented Underwater Glider for Hands-on Investigative Engineering). The ROUGHIE2 design is a rethinking of the original ROUGHIE capabilities to serve as a mobile charger by increasing depth rating, endurance, and payload capacity. The recharging concept presented will be easy to adapt to many different AUVs and UGs making this technology universal to small AUVs

    Lead User Discovery through Netnography: Transhumanist Subcultures of Grinders and Biohackers

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    Industry has already been set as a precedent that lead users are indicators for future products and areas of forming trends. By following where these lead users come from, understanding their motivations and intent of use can help discover new products. In this paper there are two groups under the ideological umbrella of Transhumanism, “Grinders” and “Biohackers” which are fringe groups where we felt there were possible lead users. To study them, we employed the use of the Unified Theory of Adoption and Use of Technology as a framework to gain an understanding of their characteristics and motivations. By doing so, we understood them well enough to apply netnography in conjunction with lead user characteristics to identify lead users on internet forums. From our research methodology, we found lead users within these two groups and possible marketable products. Some of which include implantable technology and methods to better understand people’s nutritional needs through genome testing

    Submarine glacial landforms on the Bay of Fundy–northern Gulf of Maine continental shelf

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    Author Posting. © The Author(s), 2016. This is the author's version of the work. It is posted here by permission of Geological Society of London for personal use, not for redistribution. The definitive version was published in Geological Society, London, Memoirs 46 (2016): 429-436, doi:10.1144/M46.154.The Bay of Fundy–northern Gulf of Maine region surrounds the southern part of Nova Scotia, encompassing, from west to east, the Bay of Fundy, Grand Manan Basin, German Bank, Browns Bank, Northeast Channel, and northeastern Georges Bank (Fig. 1a). During the last glacial maximum (~24–20 14C ka BP), the southeast margin of the Laurentide Ice Sheet (LIS) occupied the study area, the rest of the Gulf of Maine, and the continental Scotian Shelf off Atlantic Canada (see Dyke et al. 2002, Fig. 1; Hundert & Piper 2008, Fig. 16; Shaw et al. 2006, Fig. 8). Early mapping of the glaciated region on the Scotian Shelf using side-scan sonar imagery and seismic reflection profiles revealed topographic features interpreted to be recessional moraines indicative of retreat of the LIS (King et al. 1972; King 1996; Stea et al. 1998). Subsequently, multibeam sonar seafloor mapping of local-scale glacial landforms on the inner Scotian Shelf off Halifax, Nova Scotia (Fig. 1a) provided further information on the dynamics of the advance and retreat of the ice sheet (Loncarevic et al. 1994). Interpretation of seismic reflection profiles across Georges Bank revealed that the surficial sediment is a veneer of glacial debris transported to Georges Bank by the LIS during the late Pleistocene from continental areas to the north (Shepard et al. 1934; Knott & Hoskins 1968; Oldale & Uchupi 1970; Schlee 1973; Schlee & Pratt 1970; Twichell et al. 1987; Fader et al. 1988). Recent high-resolution multibeam sonar surveys of German Bank and the Bay of Fundy mapped a complex of ice-advance and ice-retreat features attributed to the activity of the LIS (Todd et al. 2007; Todd & Shaw 2012).2017-11-0

    Comparison of embedded and added motor imagery training in patients after stroke: Results of a randomised controlled pilot trial

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    Copyright @ 2012 Schuster et al; licensee BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.Background: Motor imagery (MI) when combined with physiotherapy can offer functional benefits after stroke. Two MI integration strategies exist: added and embedded MI. Both approaches were compared when learning a complex motor task (MT): ‘Going down, laying on the floor, and getting up again’. Methods: Outpatients after first stroke participated in a single-blinded, randomised controlled trial with MI embedded into physiotherapy (EG1), MI added to physiotherapy (EG2), and a control group (CG). All groups participated in six physiotherapy sessions. Primary study outcome was time (sec) to perform the motor task at pre and post-intervention. Secondary outcomes: level of help needed, stages of MT-completion, independence, balance, fear of falling (FOF), MI ability. Data were collected four times: twice during one week baseline phase (BL, T0), following the two week intervention (T1), after a two week follow-up (FU). Analysis of variance was performed. Results: Thirty nine outpatients were included (12 females, age: 63.4 ± 10 years; time since stroke: 3.5 ± 2 years; 29 with an ischemic event). All were able to complete the motor task using the standardised 7-step procedure and reduced FOF at T0, T1, and FU. Times to perform the MT at baseline were 44.2 ± 22s, 64.6 ± 50s, and 118.3 ± 93s for EG1 (N = 13), EG2 (N = 12), and CG (N = 14). All groups showed significant improvement in time to complete the MT (p < 0.001) and degree of help needed to perform the task: minimal assistance to supervision (CG) and independent performance (EG1+2). No between group differences were found. Only EG1 demonstrated changes in MI ability over time with the visual indicator increasing from T0 to T1 and decreasing from T1 to FU. The kinaesthetic indicator increased from T1 to FU. Patients indicated to value the MI training and continued using MI for other difficult-to-perform tasks. Conclusions: Embedded or added MI training combined with physiotherapy seem to be feasible and benefi-cial to learn the MT with emphasis on getting up independently. Based on their baseline level CG had the highest potential to improve outcomes. A patient study with 35 patients per group could give a conclusive answer of a superior MI integration strategy.The research project was partially funded by the Gottfried und Julia Bangerter-Rhyner Foundation

    Prospectus, September 26, 1979

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    SMALL CHANGE BY FOOD SERVICE; Goba\u27s prayer for all; Letter to editor: Apathy justified?; U. of I. wants YOU!; Submit originals NOW!; Visual Art grad returns; To be at U. of I. tonight: Otrabanda appears; Long livers learn disco, activities fill program; Weight Program starts; BEOG increases; Student government discusses issues; Mental retardation causes and helps; Krannert features the Young Illini; Parkland Board okays budget; College Community Board promotes togetherness; Local student FFA president; Sistercelebration; Birth Defects Any Cures?; Everybody lights up for Styx concert; U. of I. finds Twain treasures; Trilingual comedy this weekend; N.O.W. fights back in rally Fri.; Leaf burning can begin October 1; W.I.R.E. forms Oct. 1-7 p.m.; Classifieds; Karate meets; Illini ranked 13th: Penthouse lists bottom 20; New players, field, for baseball; V-ball wrap-up; Illini starting time changed; Fast Freddy Contest; Freddy goes 8-5https://spark.parkland.edu/prospectus_1979/1011/thumbnail.jp

    A spectral adjustment for spatial confounding

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    Adjusting for an unmeasured confounder is generally an intractable problem, but in the spatial setting it may be possible under certain conditions. In this paper, we derive necessary conditions on the coherence between the treatment variable of interest and the unmeasured confounder that ensure the causal effect of the treatment is estimable. We specify our model and assumptions in the spectral domain to allow for different degrees of confounding at different spatial resolutions. The key assumption that ensures identifiability is that confounding present at global scales dissipates at local scales. We show that this assumption in the spectral domain is equivalent to adjusting for global-scale confounding in the spatial domain by adding a spatially smoothed version of the treatment variable to the mean of the response variable. Within this general framework, we propose a sequence of confounder adjustment methods that range from parametric adjustments based on the Matérn coherence function to more robust semiparametric methods that use smoothing splines. These ideas are applied to areal and geostatistical data for both simulated and real datasets
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